Comparison of tumor assessments using RECIST 1.1 and irRECIST, and association with overall survival.

Background: Patients treated with immune checkpoint inhibitors (ICIs) may experience pseudoprogression, which can be classified as progressive disease (PD) by Response Evaluation Criteria in Solid Tumors (RECIST) V.1.1 and could lead to inappropriate treatment discontinuation. Immune-response criteria were developed to better capture novel response patterns seen with ICIs.
Methods: We pooled data from 1765 patients with 12 types of advanced solid tumors treated with avelumab (an anti-programmed death ligand 1 (PD-L1) monoclonal antibody) monotherapy in the JAVELIN Solid Tumor and JAVELIN Merkel 200 trials, conducted a comparative analysis of tumor assessments by investigators according to RECIST 1.1 and immune-related RECIST (irRECIST), and evaluated the correlation between progression-free survival (PFS) and overall survival (OS).
Results: In total, 147 patients (8.3%) had a best overall response (BOR) of PD by RECIST 1.1 but had immune-related disease control by irRECIST (defined as immune-related BOR (irBOR) of immune-related stable disease or better). This discordance was seen irrespective of PD-L1 status and observed across all tumor types. Overall, PFS and immune-related PFS showed similar imputed rank correlations with OS.
Conclusions: The use of irRECIST identified a subset of patients with a BOR of PD by RECIST 1.1 but an irBOR of immune-related disease control by irRECIST with a distinctive survival curve, thereby providing more clinically relevant information than RECIST 1.1 alone. However, as a surrogate endpoint for OS in the whole population, immune-related PFS by irRECIST did not show improved predictive value compared with PFS by RECIST 1.1.
Competing Interests: Competing interests: JLG has received research funding from Astellas Medivation, Bavarian Nordic, Bristol Myers Squibb, EMD Serono, an affiliate of Merck KGaA, NantBioScience, and Pfizer. SPD has provided consultancy or advisory services for Amgen, GlaxoSmithKline, Immune Design, Incyte, EMD Serono, an affiliate of Merck KGaA, and Nektar Therapeutics, and received travel expenses from Adaptimmune, EMD Serono, an affiliate of Merck KGaA, and Nektar Therapeutics. JM is an employee of EMD Serono Research & Development Institute, Billerica, Massachusetts, USA, an affiliate of Merck KGaA. SPE is an employee of Merck Serono Ltd., Feltham, UK, an affiliate of Merck KGaA. MB is an employee of Merck. All other authors report no competing interests.
(© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY. Published by BMJ.)